Blindstitch mechanism for sewing-machines



A. H. DE VOE. BUNDSTITCH MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC- 27. l9l6.

Patented Nov. 4, 1919.

INVENTOR 4. W

BY 8. 'rromqzv ALBERT H. DE VOE, 0F WES'I'FIELD,

NEW JERSEY, ASSIGNOB 1'0 THE SINGER MANUFAC- TUBING comrm, A CORPORATION on NEW JERSEY.

BLINDSTITCH MECHANISM FOR SEWING-MACHINES Specification of Letters Patent.

Application filed December 27, 1916. Serial No. 189,073.

This invention relates to sewin machines equipped for blind-stitching and as for an object to so combine stitch-forming mechanism and a stri -guide that a strip of tape,

braid, or the 11 e, may first be led to theneedle, preferably in a direction transverse to a vertical plane through the line of feed, and then secured to a second ly of material by stitches, the connecting t readportions of which, between adjacent needle punctures, are hidden from view.

Another object of the invention is to so combine stitch-forming mechanism and a strip-guide or binder, having spaced fold-.

invertin edge portions, that upper and. lower phes of braid, binding or the like, may be simultaneously blind-stitched together or to the opposite sides of intermediate bodyfabric material.

More specifically the invention has for an object to so combine stitch-forming mechanism and a binder of the so-called English type that a binding strip may be blindstitched to position about the edge of a bodyfabric.

Further objects of the invention are to provide adjustments whereb the binderhead may be shifted in any irection laterally of the needle to facilitate the proper relative arrangement of the binder and needie to suit the class of work in hand, and whereby the lower and upper fold-invertin edge-portions of the binder-head may be a justed relatively to one another so that the needle ma be caused to stitch more deeply into one t an the other of the superimposed plies of the folded binding-strip.

The above and other objects, to-be hereinafter referred to, are attained by the resent invention which, in its preferred em odiment, comprises a binder of the well known English type which is adjustably mounted 11 on the throat-plate of a flat-bed sewin mac ine of usual construction in such a position that the reciprocating needle traverses abpath disposed very close to and prefery in advance of the up er and lower endportions of the U-shaped old-invertin ed 'e common to binders of this t pe. s tie bindin -strip is bent over the old-inverting edge t e needle will, at each descent, ass twice into and out of the inner or hi den surface of the binding-strip without passing through to the outer or visible surface of said strip.

To secure the desired adjustments, the throat-plate is rovided with a recess or slide-way extending in the direction of feed. Fitted within this slide-way is a slide-plate upon which is mounted for adjustment in a transverse direction the slotted shank of the binder-head. By virtue of these two separate adjustments in mutually transverse directions the binder-head mav be shifted toward or from the needle in any desired direction.

The binder-head is divided longitudinally into two parts the upper of which is mounted upon t e lower for lengthwise adjustment relative thereto, thus permitting adjustment of the 11 per fold-inverting edge-portion of the bin er without disturbing the corresponding lower fold-invertin edge-portion t ereof. A resser-foot, note ed atone side to receive t e delivery end of the binder,

is arranged to cooperate with the feed-dog in the usual manner to advance the work.

The invention will be better understood by referring to the accompanying drawings in which F1 ure 1 is a fragmentary perspective view 0? the machine with the resserfoot broken away to show the manner in which the needle splits the thickness of binding material. Fig. 2 is a plan view showin the binder head, needle, presser foot and throat-plate in their proper relative positions. Fig. 3 is a similar view with the presser-foot and work removed to show the feed-dog. Figs. 4 and 5 are side and end elevations, respectively, of the binder-head. Fig. 6 is a sectional view taken on the line 6-6, Fig. 2. Fig. 7 is an enlarged sectional view taken on the line 7-7, Fig. 2 looking in the direction of the arrows. Fig. 8 shows a modified form of the invention and Fig. 9 is a perspective view of a blind-stitched seam formed by the machine. The invention is preferably embodied in a sewing machine comprising the usual flatbed 1 and head'2 in which is journaled the Patented Nov. 4, 1919. p

resser-bar 3 and reciprocatin needle-bar v cess in the throat-plate 7 is the slide-plate 10', apertured at 11' to give access to the throat-plate screw 6 and adapted for adjustment in a direction parallel to the line of feed. The slide-plate 10 may be secured in adjusted position by means of the screw 12 which passes through the slot 13 in said slidelate and is threaded into the throatplate as shown in Fi s. 2 and 6.

The strip-guide or inder 14 is received within the recess 15 in the upper face of the throat-plate 7 and is provided with a shank 16 slotted at 17 and secured to'the slidelate by screws 18 which pass throu h the s 0t 17 and permit adjustment of the binder laterally of the line of' feed in an obvious manner. The binder is divided longitudinallyinto upper and lower sections 19 and 20, respect1vely; the upper section 19 being adjustably secured to the lower section 20 by screws 21, 21 which pass through slots 22, 22 in the upper section 19 and are threaded into the lower section 20.

In the'present instance the binder is of common form and comprises the usual U- shaped strip-guiding channel or passageway 23, Fig. 5 define by the inner U-shaped uide-wall 24 and the outer -sheath-memrs 25, 25 which together form substantiall an outer U-sha ed guide-wall 26. At its eliveryend the liinder is formed with a second passage-way 27 ,Fig. 4, extendin at right angles to t e passage-way 23 an defined by the U-shaped guide-wall 28 which intersects the inner guide-wall 24 and forms at said intersection a U-shaped fold-invertin edge which is disposed in a plane para lel to the needle and includes the upper and lower fold-inverting edgeportions, or foldpresenting elements 29 and 30, respectively. Preferably these edge-portionsare arranged at least partially in rear of the needle 5, as shown in Figs. 3 and 4, so that the needle will descend in advance of and close to said foldinverting edge-portions and pierce or enter and emerge from the inner surfaces of the upper and lower plies of the foldedbindin -strip without passing entirely throng to the outer or visible surface of said strip, as shown in Fig. 7.

It is to be understood that by adjusting the fold-inverting edge-portions 29 and 30 closely enough to the needle-path it is possible to form a seam wherein the stitching thread or threads will appear at the opposite sides of the seam. By referring to Fig. 3 it will be noted that the channels 23 and 27, extend directly toward'the needlepath; that is, if projected in the directions of their respective len hs, they will be intersected by said need e-path. As a result, the needle will enter and emerge from the inner or hidden surfaces of the upper and lower plies of folded binding material and may or may not pass entirely through to the outer or visible surfaces of said plies dependin upon the position of adjustment of the 0 d-inverting edge-portions 29 and 30 relatively to the needle.

As the delivery end of the binder is disposed mainl in rear of and close to the needle-path it is desirable that the presserfoot 10 be notched at 31 to clear the binderhead. The forwardly disposed inclined uide-wall 32 of the notch 31 and a simiarly inclined guide-wall 33 at the end of the recess 15 are parallel to and spaced from the vertical plane or planes of the fold-inverting edge-portions 29 and 30 to assist in controlling the binding-strip b as it is being inverted and hold said strip close to the edge-portions 29 and 30 so that the needle will accurately split the material.

In the modification of the invention illus trated in Fig. 8 the inclined fold-inverting edge is shown as adjusted somewhat in advance of the needle 5 and notched at n to receive said needle which intersects "each of the an larl related guiding channels 23 and 2%? Vghile this modification will not produce blind stitching, it will produce stitching wherein I the connecting thread-portions between adjacent penetrative thread-loop structures are concealed.

One embodiment of. the seam structure which may be formed by the present improvement is illustrated in Fig. 9 wherein it indicates the body-fabric about the edge of which the folded binding-strip b is secured by a line of stitches comprisin the series of keyed, penetrative, threa -loop structures a which pass into and out of the inner or hidden surfaces of the upper and lower plies of the strip b and through the body-fabric 0.. The thread-loop structures 0 are joined b the connecting thread-portions d exten ing along said hidden surfaces. While I have illustrated thread-loop structures of the lock-stitch typeit isto be understood that the invention is not limited to the use of any particular type of stitchformin mechanism. Furthermore, in the particu ar embodiment of the seam illustrated, the location of the locking points is immaterial.

While the preferred form of the invention has been shown and described it is to be understood that the essential fee one needle uncture to the next are concealed by the bin ing strip and the body-fabric.

Having thus set forth the, nature of the invention, what I claim herein is 1. In a sewing machine, in combination, stitch-forming mechanism including a reciprocating needle and blind-stitch guiding mechanism including spaced fabric inverting elements disposed one above the other in close proximity to and in rear of the needle-path, whereby the needle will split the thickness of fabric at the folds which are formed as the fabric is drawn over said elements.

2. In a sewing machine, in combination, stitch-forming mechanism including a reciprocating needle, feeding mechanism, and means having a substantially straight foldinverting edge-portion inclined to the line of feed in a plane transverse to the needlepath, said edge-portion being located substantially at the stitching point for invertin a fiat stri of tape asit is drawn to stitching position in a direction transverse to the line of feed whereby the needle will pierce the fold which is formed as the tape is drawn over said edge-portion.

3. In a sewing machine, in combination, stitch-forming mechanism including a reciprocating needle, and a binder for guiding and folding a bilnding strip about the edge of the materialto be bound, said binder including upper and lower fold-defining elements. so positioned relatively to the needle-path that the descending needle will enter and emerge from the inner or hidden surfaces of the upper and lowerplies of the folded binding strip.

4. In a sewing machine, in combination, stitchforming mechanism includin a needle, feeding mechanism, and a tripguide. having a U-shaped guiding channel extending transversely of the line of feed and directly toward the needle-path and terminating in fold-inverting means disposed closely adjacent the needle-path.

5. In a sewing machine, in combination, stitch-forming mechanism including a needle, 'feeding mechanism, and a binder formed with a fold'inverting edge inclined binder having guidin to the line of feed and having a U-shaped' guiding channel extending transversely of the line of feed and directly toward the needle-path.

'6. In a sewing machine, in combination, a means about which :1 Ion itudinally folde binding strip is inverte and stitch-forming m'echanlsm including a reci rocating needle so positioned as to pierce t e binding strip at the point of inversion thereof. e

7. In a sewing machine, the combination with'stitch-formlng mechanism includin a needle, and feeding mechanism, of a bin er having a U-shaped fold-inverting edge disposed partially in rear of the needle-path.

8. .In a sewing machine, the combination of stitch-forming mechanism including a needle,"and feeding mechanism, of a binder formed at its delivery-end with a U-shaped guide-wall, said guide-wall being formed at its receiving end with fold-inverting edge-portions arranged in rear of and close to the needleath, wherebythe needle will blind-stitclrt e binding strip to a bodyfabric. I

9. In a sewing machine, in combination, stitch-forming mechanism including a needle, -feedingmechanism, a throat-plate having a recess in its upper face, and a binder disposed partially within said recess and having a fold-inverting edge-portion disposed in rear of and closely adjacent the needle-path. p

10. In a sewing machine, in combination, stitch forming mechanism including a needle, feeding mechanism, and an adjustably mounted binding guide comprising rela- 'tively adjustable upper and lower strip-folding sections, the delivery end of said binding guide beingformed with fold-inverting elements disposed at least partially in rear of the needle-path. r

11. In a sewing machine, in combination, stiteh-forming mechanism including a reciprocatin needle, feeding mechanism and a strip-fol ing guide formed at its dellvery end with a ,-shaped fold-inverting edge disposed substantially in a plane which is parallel to the needle-path and intersects the stitchingline in rear of said path.

12. In a sewing machine, in combination, stitch-forming mechanism including areciprocating needle, feedingmechanism and a strip-folding guide formed at its delivery end with spaced fold-inverting edge-portions disposed substantially in a plane which is parallel to the needle-path and intersects the stitching line in rear of said path.

13,. In a sewing machine, in combination, work feedin mechanism, a binder having a U-shapcd strip-guiding channel and formed at its delivery end with a fold-inverting edge, and stitch-forming mechanism including a reciprocating needle disposed in adverse] its de ivery end with fold-inverting edgevance of and close to saidfold-inverting edge.

14. In a sewingmachine, in combination, a reciprocating needle, feeding mechanism, and a binder having a U-sha ed strip-guiding channel extendm 'in a direction transof the line 0 feed and formed at portions disposed in rear of the needle.

15. In a sewing machine, in combination, stitch-forming mechanism including a needle, feeding mechanism, a resser-foot formed at one side with a notch, and a foldguide formed with a passage-way extending transversely of thedirection of feed and having its delivery end disposed within the notch of said presser-foot, the needle bein adapted to reciprocate within said note and in advance of the delivery end of said foldide.

16. n a sewing machine, in combination, stitch-fomiing mechanism including at least a needle, feeding mechanism, athroatplate having a needle aperture, and a stripguide having a passage-way extending transverse}? of the plane defined by the needle an the stitching line, said stripguide having at its delivery end an edge about which the strip is drawn into the path of the need1e,a portion of said ed e being disposed close to and in'rear of tfie needleath.

H. n a sewing machine, in combination, stitch-forming mechanism including a reci rocating needle feeding mechanism, a bin or having a -shaped fold-inverting edge arranged at least partially in rear of the needle-path, and means in advance of said edge for holding the binding strip close to the latter.

In testimony whereof I have signed my nameito this specification.

, ALBERT H. DE VOE.

It}: hereby certified that in Letters Patent No. 1,320,456, granted November 4, 1919, upon the application of Albert H. De Voe, of W'estfield, New Jersey, for an improvementin Blind'stitch'Mechanisms for Sewing-Machines," errors appear in the i t d eifiestion correction as follows: Page 4, lines 22-23, claim t ik out the words at least; same page end claim, line 30, after the word di i rt the words at least; and that the said Letters Patent should be reed with these corrections therein that the same may conform to the record of the one in the Patent Omen.

Signed and sealed thii 9th day of December, A. D., 1919.

M. H. COULSTON, Acting Oommiasiomr of Patentr.

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